package com.example.a48;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.event.EventListener;
import org.springframework.context.event.SimpleApplicationEventMulticaster;
import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
import org.springframework.stereotype.Component;

// 时间解耦例子
@Configuration
public class A48Application_2 {
    public static void main(String[] args) {
        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(A48Application_2.class);
        context.getBean(MyService.class).doBusiness();
        context.close();

        /*
            小结:
                事件监听的两种方式:
                    1. 实现 ApplicationListener 接口
                        根据接口泛型确定事件类型
                    2. @EventListener 标注监听方法
                        根据监听器方法参数确定事件类型
                        解析时机： 在 SmartInitializingSingleton（所有单例初始化完成后），解析每个单例 bean
         */
    }

    static class MyEvent extends ApplicationEvent {

        public MyEvent(Object source) {
            super(source);
        }
    }

    @Component
    static class MyService {

        private static final Logger log = LoggerFactory.getLogger(MyService.class);

        @Autowired
        private ApplicationEventPublisher publisher; // applicationContext

        public void doBusiness() {
            log.debug("主线业务");
            // 主线业务完成后需要做一些支线业务，下面是问题代码
            publisher.publishEvent(new MyEvent("MyService.doBusiness()"));
        }
    }

    @Component
    static class SmsService {
        private static final Logger log = LoggerFactory.getLogger(SmsService.class);

        @EventListener
        public void listener(MyEvent event) {
            log.debug("发送短信");
        }
    }

    @Component
    static class EmailService {
        private static final Logger log = LoggerFactory.getLogger(EmailService.class);

        @EventListener
        public void listener(MyEvent event) {
            log.debug("发送邮件");
        }
    }

    @Bean
    public ThreadPoolTaskExecutor executor() {
        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
        executor.setCorePoolSize(3);
        executor.setMaxPoolSize(10);
        executor.setQueueCapacity(100);
        return executor;
    }
    
    @Bean
    public SimpleApplicationEventMulticaster applicationEventMulticaster(ThreadPoolTaskExecutor executor){
        SimpleApplicationEventMulticaster multicaster = new SimpleApplicationEventMulticaster();
        multicaster.setTaskExecutor(executor);
        return multicaster;
    }
}
